U.S. stock futures are flat as ongoing violence in Iraq dampens sentiment; Google to unveil a TV set-top box, a report says; GoPro's IPO to price later Wednesday.

1. -- U.S. stock futures are pointing to a flat open on Wall Street Wednesday amid ongoing violence in Iraq.

European and Asian stocks declined, as rising tensions in the Middle East as well as Ukraine rattled investors and global indices.

2. -- The economic calendar in the U.S. on Wednesday includes durable-goods orders for May at 8:30 a.m. EDT, and the third estimate of first-quarter GDP at 8:30 a.m.

3. -- U.S. stocks on Tuesday fell as conflict in the Middle East and Eastern Europe flared.

The S&P 500 tumbled 0.64% to 1,949.98 after surging to an intraday high of 1,968.17 before midday. The Dow Jones Industrial Average fell 0.7% to 16,818.13. The Nasdaq peaked at a record high of 4,399.87 before sinking 0.42% to 4,350.36.

4. -- Google (GOOG) could provide an Android update, and unveil wearable gadgets and so-called smart home devices at its two-day developer conference, which begins Wednesday in San Francisco.

In recent years, the conference has focused on smartphones and tablets, but this year Google's Android operating system is expected to stretch into cars, homes and smartwatches, according to The Associated Press.

The Wall Street Journal reported Google will unveil a new television set-top box on Wednesday in its race against Amazon.com (AMZN), Apple (AAPL) and others to control digital content in the home.

The search giant on Wednesday plans to show off at least one small set-top box that resembles products like the Roku, Amazon's Fire TV, and Apple's Apple TV, according to two people who have seen the device, the Journal reported.